CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance at Dec. 31, 2017	$ 2,908.6		$ 0.9	$ 1,153.2	$ 2,029.5	$ (287.0)	$ 12.0
Beginning Balance (in shares) at Dec. 31, 2017		0.7	85.5
Cumulative effect of new accounting standard, net of tax	13.0				13.0
Net (loss) income	22.5				22.5
Currency translation adjustment	16.3					16.2	0.1
Change in qualifying cash flow hedge, net of tax	0.1					0.1
Issuance of common stock for exercise of options, RSU vesting and employee stock purchases, net	0.7			0.7
Issuance of common stock for exercise of options, RSU vesting and employee stock purchases, net (in shares)			0.1
Repurchase and cancellation of convertible preferred stock	(7.4)			(14.7)	7.3
Preferred stock dividend	(8.8)				(8.8)
Stock compensation expense	7.1			7.1
Ending Balance at Mar. 31, 2018	2,952.1		$ 0.9	1,146.3	2,063.5	(270.7)	12.1
Ending Balance (in shares) at Mar. 31, 2018		0.7	85.6
Beginning Balance at Dec. 31, 2018	2,597.1		$ 0.9	1,162.6	1,789.2	(365.3)	9.7
Beginning Balance (in shares) at Dec. 31, 2018		0.0	90.7
Net (loss) income	(37.6)				(37.8)		0.2
Currency translation adjustment	8.5					8.2	0.3
Change in qualifying cash flow hedge, net of tax	0.2					0.2
Issuance of common stock for exercise of options, RSU vesting and employee stock purchases, net	(2.0)			(2.0)
Issuance of common stock for exercise of options, RSU vesting and employee stock purchases, net (in shares)			0.1
Stock compensation expense	4.3			4.3
Change in noncontrolling interest				6.3			(6.3)
Ending Balance at Mar. 31, 2019	$ 2,570.5		$ 0.9	$ 1,171.2	$ 1,751.4	$ (356.9)	$ 3.9
Ending Balance (in shares) at Mar. 31, 2019		0.0	90.8